JP4644624B2 - Storage drain structure - Google Patents

Description

  The present invention relates to a drain outlet structure provided on the bottom wall of a storage such as a refrigerator.

  Conventionally, what is shown in FIG. 16 is known as an example of the drain outlet structure provided in the bottom wall of the refrigerator main body made of a heat insulating box. This is because circular openings 1A and 2A are formed on the same axis line in the interior bottom plate 1 and the exterior bottom plate 2 constituting the outer shell of the bottom wall of the refrigerator main body, and the back side edge of the opening 1A of the interior bottom plate 1 is formed. A burring portion 3 is formed, and a drainage port forming body 5 having a substantially cylindrical shape with flanges 4A and 4B formed at both upper and lower ends is provided. And while applying the upper flange 4A to the edge of the back side of the opening 1A of the interior bottom plate 1, the upper end portion of the drain port forming body 5 is externally fitted and fixed to the burring portion 3, and then in the foaming jig, As the inner box is fitted inside the outer box with a gap, the lower flange 4B is brought into close contact with the rear edge of the opening 2A of the outer bottom plate 2 with a ring-shaped sponge tape 6 interposed therebetween. Between the interior bottom plate 1 and the exterior bottom plate 2 from the attached state, foamed urethane as the heat insulating material 7 is filled with foam. Such a drain outlet structure is described in Patent Document 1.

Here, the interior bottom plate 1 is arranged in an inclined posture in which the front side (the right side in FIG. 16) is slightly lowered so that the drainage dripped onto the bottom surface of the interior can be smoothly guided to the drainage port forming body 5. The space between the interior bottom plate 1 and the exterior bottom plate 2 differs between the front side and the rear side of the drain port forming body 5. For this reason, as described above, a soft sponge tape 6 is sandwiched between the lower flange 4B of the drain port forming body 5 and the exterior bottom plate 2, thereby absorbing the difference in the above-described distance and sealing the entire circumference. I try to take it.
Japanese Patent Laid-Open No. 11-183018

However, when the sponge tape 6 is used as described above, foam leakage during production can be effectively prevented. However, after the product has been manufactured, it absorbs the falling water and allows the heat insulating material 7 to be submerged. However, there is a possibility that it may become unsanitary or cause a decrease in heat insulation performance. As a countermeasure, it is conceivable to separately perform caulking around the opening 2A of the exterior bottom plate 2. However, there is a problem that the manufacturing cost increases due to the increase in the number of manufacturing steps.
The present invention has been completed based on the above circumstances, and an object of the present invention is to improve the sealing performance of the assembly portion of the drain port forming body by a simple correspondence.

  As a means for achieving the above object, the invention of claim 1 is characterized in that a drain outlet is provided on a bottom wall of a storage body formed by filling a heat insulating material made of foamed resin between an inner box and an outer box. Each of the interior bottom plate and the exterior bottom plate is provided with an opening on the same axis, and the drain outlet forming body having a substantially cylindrical shape is assembled between the openings. In the drain outlet structure of the storage, in which the space between the interior bottom plate and the exterior bottom plate is foam filled with the heat insulating material, the interior bottom plate or the exterior bottom plate facing either one of the upper and lower ends of the drain outlet formation body The other end of the drainage port forming body is fitted with a cylindrical packing with a hem extending and is opposed to the interior bottom plate or Mouth on the back side of the opening in the exterior bottom plate The portion is provided with a positioning portion that engages with the skirt portion of the packing and restricts the radial expansion of the skirt portion, and the packing further faces after the radial expansion of the skirt portion is restricted. Along with the approach to the interior bottom plate or the exterior bottom plate, the skirt is elastically opened and deformed while closely contacting the rim portion on the back side of the opposed opening.

According to a second aspect of the present invention, in the first aspect of the present invention, the positioning portion may be a ring-shaped rising provided at a rim portion on the back side of the opening in the interior bottom plate or the exterior bottom plate facing the packing. It is formed by a surface, and the tip edge of the skirt portion of the packing is in contact with the rising surface, and is characterized in that radial expansion is restricted.
The invention according to claim 3 is characterized in that, in the invention according to claim 1, the rising surface is provided with a cover portion that covers and prevents the packing from contacting the bottom surface of the packing. Have.

According to a fourth aspect of the present invention, in the third aspect of the present invention, a ring-shaped rising surface is provided at an edge portion on the back side of the opening in the interior bottom plate or the exterior bottom plate facing the packing, and the rising surface A groove portion into which the skirt portion of the packing is inserted is cut on the base portion side, and an opening edge of the groove portion serves as the positioning portion that engages with the skirt portion of the packing and restricts radial expansion. It has a characteristic where it exists.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a reinforcing plate is provided on the back surface of the interior bottom plate or the exterior bottom plate facing the packing. The positioning portion is formed by concentrically forming an opening larger than the opening of the interior bottom plate or the exterior bottom plate.

<Invention of Claim 1>
The drain port forming body is fixed by being applied to the interior bottom plate or the back surface opening edge of the opening of the exterior bottom plate facing one of the upper and lower ends, and the packing fitted to the other end is opposed to the interior It is applied to the rear edge of the opening of the bottom plate or the exterior bottom plate. At that time, the expansion of the radial direction is restricted by engaging the skirt portion of the packing with the positioning portion provided on the other back surface edge, and the packing further approaches the opposite back surface edge, While the bottom of the packing is elastically opened and deformed, it adheres closely to the other back mouth edge over a wide area. The heat insulating material is foam-filled into the space between the inner and outer bottom plates from the assembled state.

Since the bottom of the packing can be brought into close contact with the other end of the back surface over a wide area, the sealing performance is improved, and not only leakage of foaming of the heat insulating material but also water from the outside can be surely prevented. In addition, even if there is a difference in the interval between the interior bottom plate and the exterior bottom plate around the drain port forming body, the packing absorbs the difference in the interval while partially changing the opening angle of the cylindrical portion, and extends over the entire circumference. The contact area of the hem can be increased, that is, high sealing performance can be ensured.
As a result, it is possible to eliminate the need for a separate coking process, and to reduce the manufacturing cost.

<Invention of Claim 2>
The skirt of the packing is fitted inside the ring-shaped rising surface, and the tip edge of the skirt hits the rising surface, thereby restricting radial expansion. After that, the skirt part is elastically opened and deformed, and is in close contact with the other back edge part.
<Invention of Claim 3>
When the skirt of the packing hits the rising surface and the expansion in the radial direction is restricted, the skirt is covered with the covering portion, so that the skirt is reliably prevented from coming off from the rising surface.

<Invention of Claim 4>
When the skirt of the packing is fitted inside the rising surface, the skirt is inserted into the groove cut on the base side of the rising surface, and the hem is locked to the opening edge of the groove to expand in the radial direction. Is regulated. After that, the skirt part is elastically opened and deformed, and is in close contact with the other back edge part.
<Invention of Claim 5>
When attaching legs to the storage body, a reinforcing plate is stretched on the back of the exterior bottom plate or the interior bottom plate, but the positioning plate is formed by concentrically forming an opening larger than the opening of the bottom plate on the reinforcing plate. . The positioning part can be provided by using an existing reinforcing plate, and can be handled at a lower cost than the case where the positioning part is provided by a new member.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the case where it applies to a horizontal refrigerator is illustrated.
As shown in FIG. 1, the horizontal refrigerator includes a refrigerator main body 10 having a horizontally long box shape opened on the front surface, the inside of which is a storage chamber 11, and the left side as viewed from the front of the refrigerator main body 10. In the upper position, a cooler chamber 12 is formed so as to extend in communication with the storage chamber 11. The refrigerator main body 10 and the cooler chamber 12 are integrally formed by a heat insulating box 13, and roughly, an interior box 14 made of a stainless steel plate is assembled inside the exterior box 15 at a predetermined interval. In this structure, the space between the inner and outer boxes 14 and 15 is filled with foamed resin 16 such as urethane foam as a heat insulating material.

The refrigerator body 10 is supported by legs 18 provided at the four corners of the outer bottom surface, and the opening edges of the interior box 14 and the exterior box 15 are connected by a synthetic resin joiner 19 as shown in FIG. As a result, a rectangular front opening 21 is formed. A partition wall 22 is disposed at the center of the front opening 21 in the width direction, and two left and right entrances 23 are formed. A heat insulating door (not shown) is attached to each entrance 23.
A machine room 25 is provided on the left side surface of the refrigerator main body 10, and a cooling unit is housed in the machine room 25 so that the cooling unit can be pulled out. The above-described cooler chamber 12 having a not-shown) is disposed, and a storage space is secured on the lower side.

The cooling unit is unitized by stacking a cooler 27 and an internal fan 28 via a heat-insulating cooler chamber lid on the upper surface of a refrigeration apparatus 26 including a compressor, a condenser, and the like. When inserted from the front, the refrigeration device 26 is stored in the storage space, the cooler 27 and the internal fan 28 are stored in the cooler chamber 12, and the inlet / outlet is closed by the cooler chamber lid. .
When the refrigeration device 26 (compressor) and the internal fan 28 are driven in accordance with the cooling operation, the air in the storage chamber 11 is provided on the lower side of the cooler 27 as shown by the arrow in FIG. After being sucked in from the suction port 29A and circulated through the cooler 27 and converted into cold air, the air is circulated and supplied so as to be blown out from the air outlet 29B to the ceiling surface side of the storage chamber 11, whereby the inside of the storage chamber 11 Is supposed to be cooled.
The inner bottom surface of the storage chamber 11 is an inclined surface gently descending to the front side, and is located at a position close to the front end portion of the inner bottom surface in the width direction of the left entrance 23 as viewed from the front. A vertical drainage port 30 reaching the outer bottom surface is formed at a position substantially corresponding to the center.

Next, the structure of the drain port 30 will be described in detail.
As described above in part, the bottom wall 11A of the storage chamber 11 includes the bottom plate 32 in the interior box 14 (hereinafter referred to as the interior bottom plate 32) and the bottom plate 36 in the exterior box 15 (hereinafter referred to as the exterior bottom plate 36). Are arranged opposite to each other with a predetermined interval therebetween to form an outer shell, and the foamed resin 16 is filled therein (see FIG. 10).
As shown in FIG. 2, a circular hole 33 is formed at the position where the drainage port 30 is formed in the interior bottom plate 32, and the position where the exterior bottom plate 36 is formed is slightly larger than the circular hole 33 on the interior bottom plate 32 side. A large-diameter circular hole 37 is formed on the same axis. From the rear edge of the circular hole 33 of the interior bottom plate 32, a tapered annular portion 34 having a diameter gradually reduced downward is formed by burring or the like. The inclination angle α of the annular portion 34 is, for example, 60 degrees.

On the back surface of one exterior bottom plate 36, a reinforcing plate 40 is stretched along the edge on the near side (right side in FIG. 2). The reinforcing plate 40 is used to reinforce the exterior bottom plate 36 to attach the above-described legs 18 and is formed from a thick steel plate. Also on the back side, a reinforcing plate is stretched in a region including the attachment location of the legs 18, but detailed description thereof is omitted.
The front reinforcing plate 40 has a length comparable to the opening of the storage chamber 11 and a width reaching the position beyond the circular hole 37 described above from the front edge of the exterior bottom plate 36, A front plate 41 is formed to rise at a right angle at the front edge. The height of the front plate 41 is about half of the height of the front plate 38 that is formed at a right angle from the front edge of the exterior bottom plate 36.

The reinforcing plate 40 is placed along the front edge of the exterior bottom plate 36 with the front plate 41 applied to the front plate 38 of the exterior bottom plate 36, and is spaced in the length direction at the front edge of the exterior bottom plate 36. A plurality of locations where the holes are opened are fixed to the exterior bottom plate 36 through angle-shaped brackets 43. Attachment members 44 for attaching the legs 18 are provided on the upper surfaces of both ends of the reinforcing plate 40 in the length direction.
A circular fitting hole 65 that is slightly larger than the circular hole 37 is formed concentrically at a position corresponding to the circular hole 37 of the exterior bottom plate 36 in the reinforcing plate 40. The fitting hole 65 will be described in detail later.

  From the rear edge of the reinforcing plate 40, a receiving plate 47 is formed at a right angle. An insertion groove 48 into which a positioning rib 75A provided on the drain port forming body 50 is inserted from above is formed at a position corresponding to the rear edge of the center of the fitting hole 65 at the upper edge of the receiving plate 47. ing. As shown in FIG. 8, the insertion groove 48 is formed as a V-shaped notch groove whose upper end is gradually opened. For example, the opening β is 90 degrees and the depth is 1 of the height of the receiving plate 47. / 3 (about 10 mm).

A drain port forming body 50 is mounted between the circular holes 33 and 37 of the interior bottom plate 32 and the exterior bottom plate 36. The drain port forming body 50 is made of synthetic resin, and as shown in FIGS. 2 to 4, as a whole, the drain port forming body 50 has a height slightly smaller than a regular corresponding interval between the interior bottom plate 32 and the exterior bottom plate 36. It is formed in a cylindrical shape with dimensions.
More specifically, it has a cylindrical main body 51 having an outer diameter slightly smaller than the circular hole 33 of the interior bottom plate 32, and a flange 52 is formed on the entire upper end of the main body 51. In addition, an oblique chamfered portion 53 is formed at a corner portion on the base side of the flange 52. The lower end of the chamfered portion 53 is retracted to the outside in a step shape from the inner peripheral surface of the main body portion 51. Then, on the upper end side of the drain port forming body 50, the chamfered portion 53 at the base of the flange 52 is fitted and applied to the back side of the annular portion 34 of the interior bottom plate 32, and the flange 52 is also connected to the circular hole 33 in the interior bottom plate 32. It is designed to be applied to the lip on the back side of the.

  On the other hand, an outer cylinder 56 is formed on the lower end side of the main body 51 so as to constitute a double cylinder, and the lower end of the outer cylinder 56 hangs a predetermined length from the lower end of the main body 51. A female screw 57 for screwing a joint (not shown) for connecting a drain hose is cut on the inner peripheral surface of the outer cylinder 56, and a packing 60 is attached to the lower end portion of the outer peripheral surface. A mounting rod 58 is formed.

The packing 60 is formed of an elastic material such as rubber, and as shown in FIG. 5, a skirt portion 63 having a narrow cylindrical shape with a hem and a so-called trumpet shape is formed on the lower surface side of the thick ring portion 61. It is a formed shape. A mounting groove 62 into which the mounting rod 58 is fitted is formed on the inner peripheral surface of the ring portion 61 over the entire circumference. Further, the skirt portion 63 is formed so as to be gradually thinner toward the skirt portion 64, and the tip edge 64 </ b> A of the skirt portion 64 is rounded.
As shown in FIG. 2, the packing 60 has a drain port forming body in a state in which the skirt portion 63 projects downward from the lower end of the outer cylinder 56 by fitting a mounting rod 58 in the mounting groove 62 of the ring portion 61. 50 is attached to the lower end portion. When the packing 60 is attached, the height dimension from the skirt portion 64 of the skirt portion 63 of the packing 60 in the natural state to the upper surface of the flange 52 is larger than the normal corresponding interval between the interior bottom plate 32 and the exterior bottom plate 36. Also set to be a little larger.

On the other hand, as described above, a circular fitting hole 65 that is slightly larger than the circular hole 37 of the exterior bottom plate 36 is formed in the reinforcing plate 40 concentrically with the circular hole 37. The fitting hole 65 has a tapered shape whose diameter is gradually reduced upward from the back side (upper) mouth edge by performing burring processing in which the mouth edge is knocked out from the front side (lower side). An annulus 66 is formed. The inclination angle γ of the ring-shaped portion 66 is about 25 degrees (see FIG. 5).
By forming the annular portion 66, when the reinforcing plate 40 is stretched on the back surface of the exterior bottom plate 36, the opening height gradually decreases between the annular portion 66 and the exterior bottom plate 36 toward the back side. A groove 67 having a substantially triangular cross section is formed over the entire circumference. In addition, the inner peripheral surface of the ring-shaped portion 66 (fitting hole 65) is an inclined surface that expands upward, and functions as a guide surface 68.

The diameter R of the lower end of the guide surface 68 in the ring-shaped part 66 is substantially equal to the diameter of the skirt part 64 of the skirt part 63 of the packing 60 in the natural state. Further, the opening height of the groove portion 67 is substantially halfway into the depth, and becomes lower than the thickness of the skirt portion 64 of the skirt portion 63, that is, the leading edge 64 </ b> A of the skirt portion 64 of the skirt portion 63 is substantially within the groove portion 67. When half approached, further approach is restricted (see FIG. 9). In other words, the tip edge 64A of the skirt portion 64 is restricted from expanding in the radial direction when it hits the midway position of the upper surface of the groove portion 67. Therefore, the upper surface of the groove portion 67 becomes the rising surface 70 of the present application, It becomes the positioning part 71 of this application.
Further, the portion on the opening end side of the upper surface of the groove portion 67 relative to the positioning portion 71 covers the upper portion of the skirt portion 64 and functions as a detachment stop, and this portion corresponds to the covering portion 72 of the present application.

On the outer peripheral surface of the drain port forming body 50, four ribs 75 forming a vertically oriented plate shape for reinforcement and the like are radially projected with an angular interval of 90 degrees. Each rib 75 is formed over a height region from the chamfered portion 53 to the substantially central height position of the outer cylinder 56, and in the three ribs 75 of the four ribs, the outward projecting edge has an upper end. In the approximately 2/3 height region, the inclined edge 76 has a protruding length that gradually increases downward, and in the remaining lower region, the vertical edge 77 has the same protruding amount as the lower end of the inclined edge 76. Yes.
On the other hand, the remaining one rib 75A has an outwardly protruding edge that is an inclined edge 76A having a protruding length that gradually increases downward over the entire height. Compared with 75, the outward projecting length is extended at the lower end, and this extended portion serves as a positioning plate 78.

  As will be described later, the upper end portion of the drain port forming body 50 is fixed in advance to the back surface side of the circular hole 33 of the interior bottom plate 32 in a rotating posture in which the positioning rib 75A faces back. From this state, as shown in FIG. 2, when the interior bottom plate 32 and the exterior bottom plate 36 are opposed to each other with their circular holes 33 and 37 being aligned, the positioning plate 78 of the positioning rib 75A receives the receiving plate. It will be in the state protruded just above the insertion groove 48 formed in the upper edge of the board 47. FIG. As the interior bottom plate 32 approaches the exterior bottom plate 36, the positioning plate 78 of the positioning rib 75A is inserted into the insertion groove 48 from above, and hits both side surfaces slightly above the deepest portion of the insertion groove 48. Thus, further approach is restricted, and at this time, the interior bottom plate 32 and the exterior bottom plate 36 face each other with a regular interval.

A cap 80 is fitted into the upper end portion of the drain port forming body 50. The cap 80 is made of synthetic rubber, and has a thickness that can be fitted into a slightly strong region on the upper end side of the main body 51, as shown in FIGS. Is formed in a circular stopper shape with a small diameter step. The upper large-diameter portion 81 has a tapered shape in which the outer peripheral surface gradually decreases in diameter toward the lower side, and extends from the surface of the chamfered portion 53 at the base of the flange 52 to the lower portion thereof around the vertical axis. Are fitted so as to be rotatable.
On the upper surface of the large-diameter portion 81, as shown in FIG. 6, a knob portion 82 is formed that has a shape in which a circular recess is partitioned by a wall.

A pair of locked plates 84 projecting outward are formed at 180 ° intervals at a lower end position on the outer peripheral surface of the small diameter portion 83 and at a position orthogonal to the partition wall of the knob portion 82. The dimension between the projecting ends of both of the locked plates 84 is slightly smaller than the inner diameter of the main body 51 of the drain port forming body 50, and there is a central portion in the width direction on the upper surface of each of the locked plates 84. 6 and 7, a locked protrusion 84A having a trapezoidal cross section is formed.
On the other hand, on the inner peripheral surface of the main body 51 of the drain port formation body 50, a pair of locking portions 85 that are long in the circumferential direction are formed in a point-symmetric posture at a substantially central height position. Each locking portion 85 can have the locked plate 84 of the cap 80 hidden under the lower surface thereof, and has a length substantially equal to the width of the locked plate 84. As shown in FIG. 2, an oblique guide surface 86 is formed on one end side (the rear end in the clockwise direction when viewed from the upper surface) of the locking portion 85, and a stopper 87 is directed downward on the other end side. Is formed. Further, a locking groove 88 into which the locked protrusion 84A is fitted when the locked plate 84 stops by hitting the stopper 87 is formed at the center of the lower surface of the locking portion 85.

  In a state in which the locked plate 84 of the cap 80 wraps around the lower surface side of the locking portion 85, the substantially central height position on the tapered outer peripheral surface of the large diameter portion 81 of the cap 80 is as shown in FIG. 8. In addition, it is pressed against the inner peripheral edge of the stepped portion 54 in the main body 51 of the drain port forming body 50 and the upper surface of the large diameter portion 81 is set to be substantially flush with the upper surface of the flange 52 of the drain port forming body 50. ing.

Subsequently, a manufacturing procedure will be described.
First, as shown in FIG. 2, the packing 60 is attached to the lower end side of the drain port forming body 50, and then the drain port forming body 50 is attached to the lower surface side of the circular hole 33 of the interior bottom plate 32. For this purpose, the drain port forming body 50 is set in a pivoting posture with the positioning rib 75A facing directly behind (the left side in the figure), and the chamfered portion 53 at the base of the flange 52 is on the back side (outside of the annular portion 34 of the interior bottom plate 32). ). As shown in FIG. 7, the pressing is stopped when the flange 52 is brought into contact with the rear edge of the circular hole 33, and the chamfered portion 53 is also brought into contact with the back surface of the annular portion 34.

From this state, the cap 80 is fitted into the upper end portion of the drain port forming body 50. For this, the knob 82 is picked, and the cap 80 is turned so that the locked plate 84 comes to a position orthogonal to the locking portion 85 as shown in FIG. Is fitted into the upper end of the main body 51. When the outer peripheral surface of the large-diameter portion 81 hits the inner peripheral edge of the stepped portion 54 and the pushing is restricted, the cap 80 is rotated in the clockwise direction as viewed from the upper surface.
When the cap 80 is rotated, the locked plate 84 enters the lower side of the guide surface 86 of the corresponding locking portion 85 and is guided by the guide surface 86 so that the cap 80 sinks and The stop plate 84 goes around to the lower surface side of the locking portion 85. Then, the rotation is stopped when the front end of the locked plate 84 in the rotating direction hits the stopper 87 of the locking portion 85, and the locked protrusion 84 </ b> A is fitted in the locking groove 88.

  Thereby, as shown in FIG. 8, the cap 80 is prevented from being detached upward and fitted. At the same time, the tapered outer peripheral surface of the large-diameter portion 81 of the cap 80 is engaged with the surface of the tapered annular portion 34 so that the annular portion 34 of the interior bottom plate 32 faces upward. The drainage port forming body 50 is concentrically fixed to the back surface side of the circular hole 33 of the interior bottom plate 32 in a rotational posture in which the positioning rib 75A is directed rearward.

  Next, in a foaming jig (not shown), the interior box 14 is assembled in the exterior box 15 with a gap. In the portion of the bottom wall 11A, the interior bottom plate 32 in a state where the drain port forming body 50 is fixed as described above serves as the center of the circular hole 33 (drain port forming body 50) and the circular hole 37 of the outer bottom plate 36. And is made to approach the exterior bottom plate 36 as shown by the arrow in FIG. As the interior bottom plate 32 approaches, the positioning plate 78 of the positioning rib 75A provided in the drain port forming body 50 is inserted from above into the insertion groove 48 of the receiving plate 47 raised from the reinforcing plate 40. As shown in FIG. 9, when the lower edge of the positioning plate 78 hits both side surfaces on the bottom side of the insertion groove 48, further approach is restricted, and consequently the facing distance between the interior bottom plate 32 and the exterior bottom plate 36 is a predetermined distance. Maintained at intervals.

  During this time, the skirt portion 64 of the skirt portion 63 of the packing 60 is fitted into the fitting hole 65. Specifically, the skirt portion 64 of the skirt portion 63 is guided by the guide surface 68 and fits inside the ring-shaped portion 66, hits the edge 37 </ b> A on the back side (upper surface side) of the circular hole 37 of the exterior bottom plate 36, As the bottom plate 32 approaches the exterior bottom plate 36, in other words, as the drain port forming body 50 is lowered, the entire skirt portion 63 is deformed so that the tip edge 64A of the skirt portion 64 enters the groove portion 67. . The skirt portion 63 is formed to be gradually thinner toward the skirt portion 64, and the tip edge 64 </ b> A of the skirt portion 64 is rounded, and the groove portion 67 has a wide triangular cross section. The leading edge 64A smoothly enters the groove 67.

  When the leading edge 64A of the skirt 64 enters the midway position of the groove 67, the leading edge 64A of the skirt 64 may further expand in the radial direction by hitting the positioning portion 71 on the upper surface (rising surface 70) of the groove 67. As shown in FIG. 9, the skirt portion 64 is elastically opened and deformed as the drain port forming body 50 is lowered until the interval between the inner bottom plate 32 and the outer bottom plate 36 is set to a predetermined interval. In close contact with the edge 37A on the back side of the circular hole 37 of the exterior bottom plate 36 over a wide area. As a result, the space between the lower end of the drain port forming body 50 and the circular hole 37 of the exterior bottom plate 36 is sealed.

In addition, the leading edge 64A of the skirt 64 is inserted up to a midway position in the groove 67, that is, the leading edge 64A of the skirt 64 is covered with the cover 72, so that the leading edge 64A of the skirt 64 is removed. Is prevented.
As already described, since the interior bottom plate 32 is arranged in a posture that has a gentle downward slope toward the front side, the rear side of the mounting position of the drainage port forming body 50 is compared to the front side. The space between the interior bottom plate 32 and the exterior bottom plate 36 is large. However, this difference in the gap is absorbed by the skirt portion 63 of the packing 60 being opened and deformed more greatly on the front side, and the skirt portion 64 of the skirt portion 63 has a large area over the entire circumference and has a circular hole in the exterior bottom plate 36. 37 can be in close contact with the edge 37A on the back side.

Finally, a joiner 19 is mounted between the opening edges of the interior bottom plate 32 (interior box 14) and the exterior bottom plate 36 (exterior box 15) to form an outer shell, and the foamed resin 16 is filled in the outer shell. By solidifying, as shown in FIG. 10, the heat insulation box 13 which comprises the refrigerator main body 10 and the cooler chamber 12 is manufactured. At this time, since the gap between the lower end of the drain port forming body 50 and the circular hole 37 of the exterior bottom plate 36 is sealed with the packing 60, leakage of the foamed resin is prevented.
When the refrigerator is used, even if moisture is sprinkled on the outer bottom surface of the refrigerator body 10, a packing 60 made of rubber or the like is provided between the lower end of the drain port formation body 50 and the circular hole 37 of the exterior bottom plate 36. In addition, since the skirt portion 64 of the packing 60 is tightly sealed by being closely attached to the edge portion 37A on the back side of the circular hole 37 of the exterior bottom plate 36 over a wide area, the moisture is insulated in the heat insulating box 13. Infiltration into the material (foamed resin 16) is prevented.

  As described above, according to the present embodiment, as a means for sealing between the lower end of the drain port forming body 50 and the circular hole 37 of the exterior bottom plate 36, a skirt having a trumpet shape is formed at the lower end of the drain port forming body 50. While the packing 60 having the portion 63 is fitted, a positioning portion 71 is provided around the circular hole 37 of the outer bottom plate 36 to restrict the tip edge 64A of the skirt portion 64 of the skirt portion 63 to expand in the radial direction. Since the skirt portion 63 of the skirt portion 63 is elastically opened and deformed, the skirt portion 64 can be brought into close contact with the mouth edge portion 37A of the circular hole 37 of the exterior bottom plate 36 over a wide area.

That is, high sealing performance can be obtained with a simple structure, and it is possible to reliably prevent water leakage from the outside as well as foam leakage of the foamed resin 16 as a heat insulating material. Further, even if there is a difference in the interval between the interior bottom plate 32 and the exterior bottom plate 36 before and after the drain port forming body 50, the packing 60 absorbs the difference in the interval while changing the opening angle of the skirt portion 63 in the front and rear. The contact area of the skirt 64 can be increased over the entire circumference, that is, high sealing performance can be ensured. As a result, it is possible to eliminate the need for a separate coking process, and to reduce the manufacturing cost.
Further, in providing the positioning portion 71 described above, since the existing reinforcing plate 40 provided to reinforce the exterior bottom plate 36 is used when the legs 18 are attached, compared with the case where the positioning portion 71 is provided by a new member. Can be handled at low cost.

<Embodiment 2>
In the following, a number of embodiments in which the seal structure by the packing 60 is further changed will be described. FIG. 11 shows Embodiment 2 of the present invention.
In the second embodiment, a groove portion 90 having a substantially triangular cross section in which the opening height gradually decreases toward the back side in an approximately 2/3 region on the lower side of the inner peripheral surface of the fitting hole 65A of the reinforcing plate 40A. Is formed over the entire circumference. Moreover, the opening height of the groove part 90 is lower than the thickness of the skirt part 64 of the skirt part 63 when entering into the back substantially half. Therefore, the tip edge 64A of the skirt portion 64 is restricted from expanding in the radial direction when it hits the middle position of the upper surface of the groove portion 90, and the upper surface of the groove portion 90 is the rising surface 91 and the position where the tip edge 64A of the skirt portion 64 hits. Becomes the positioning portion 92. Further, a region closer to the opening end than the positioning portion 92 on the upper surface of the groove portion 90 becomes the cover portion 93.

  That is, in the second embodiment, when the skirt portion 64 of the skirt portion 63 of the packing 60 is fitted into the fitting hole 65 of the reinforcing plate 40A, and the packing 60 is further lowered, the entire skirt portion 63 is deformed so as to expand. 64 leading edge 64A enters the groove portion 90, the tip edge 64A of the skirt portion 64 hits the positioning portion 92 of the upper surface (rising surface 91) of the groove portion 90, it is restricted to further expand in the radial direction, While the packing 60 is lowered to a predetermined position, the skirt portion 64 is elastically opened and deformed, and is in close contact with the mouth edge portion 37A on the back side of the circular hole 37 of the exterior bottom plate 36, and high sealing performance is obtained. The tip edge 64 </ b> A of the skirt portion 64 fits into the groove portion 90, i.e., is covered with the cover portion 93, so that it cannot be easily removed.

<Embodiment 3>
FIG. 12 shows Embodiment 3 of the present invention. In the third embodiment, a relatively shallow groove 95 having a rectangular cross section with a constant opening height is formed over the entire circumference in a substantially half region on the lower side of the inner peripheral surface of the fitting hole 65B of the reinforcing plate 40B. ing. When the leading edge 64A of the skirt portion 64 of the skirt portion 63 in the packing 60 enters the groove portion 90 and then comes into contact with the back surface thereof, the radial expansion is restricted. Therefore, the back surface of the groove portion 90 is the rising surface 96 of the present application, and at the same time serves as a positioning portion. Further, the entire area of the upper surface of the groove portion 90 becomes a cover portion 97.
The effects are almost the same as in the second embodiment.

<Embodiment 4>
FIG. 13 shows Embodiment 4 of the present invention. In the fourth embodiment, the inner peripheral surface of the fitting hole 65C of the reinforcing plate 40C is the rising surface 100, and the leading edge 64A of the skirt portion 64 of the skirt portion 63 of the packing 60 is formed at the lower end portion of the rising surface 100. The radial expansion is regulated by hitting. On the other hand, the edge portion 37A of the circular hole 37 of the exterior bottom plate 36 is knocked out from below to form a tapered receiving portion 102 that faces gently upward.
In the fourth embodiment, after the skirt portion 64 of the skirt portion 63 of the packing 60 is fitted into the fitting hole 65C, the tip edge 64A of the skirt portion 64 expands, and the tip edge 64A hits the lower end portion of the rising surface 100. After the expansion in the radial direction is restricted, the skirt portion 64 is elastically opened and deformed, and is in close contact with the receiving portion 102 over a wide area, and high sealing performance is obtained.

<Embodiment 5>
14 and 15 show Embodiment 5 of the present invention. In the fifth embodiment, an annular region having a predetermined width at the rim of the fitting hole 65D of the reinforcing plate 40D is struck out in a step shape upward, and an opening height is between the step portion 105 and the exterior bottom plate 36. A relatively deep groove 106 having a constant length is formed over the entire circumference. The opening height of the groove portion 106 is set to be slightly larger than the thickness of the tip edge 64 </ b> A of the skirt portion 64 of the skirt portion 63 in the packing 60. That is, when the leading edge 64A of the skirt 64 slightly enters the groove 106, the opening edge of the upper surface of the groove 90 is locked so as to bite into the upper surface of the skirt 64, and the radial expansion is restricted. The opening edge on the upper surface of the groove portion 106 becomes the positioning portion 107.

  In the fifth embodiment, the skirt portion 64 of the skirt portion 63 of the packing 60 is fitted into the fitting hole 65D of the reinforcing plate 40D, and when the packing 60 is further lowered, the entire skirt portion 63 is deformed so as to expand. 64A enters the groove portion 106 and enters the groove portion 106. When the positioning portion 107 which is the opening edge of the upper surface of the groove portion 90 is engaged with the upper surface of the skirt portion 64, the tip edge 64A further expands in the radial direction. Is regulated. While the packing 60 is lowered to a predetermined position, as shown in FIG. 15, the skirt portion 64 is elastically opened and deformed, and adheres closely to the edge portion 37A on the back side of the circular hole 37 of the exterior bottom plate 36 over a wide area. High sealing performance can be obtained. Since the leading edge 64A of the skirt portion 64 is fitted in the groove portion 106, detachment is prevented.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the reinforcing plate is used when providing the positioning portion, but it may be provided as a separate member.
(2) In the above embodiment, the case where the cap is used to fix the drain port forming body to the interior bottom plate is illustrated, but it may be fixed using a seal tape or a caulking material. It is included in the technical scope of the invention.

(3) Contrary to the above-described embodiment, the lower end side of the drain port forming body is fixed to the back side opening edge of the opening of the exterior bottom plate, while a packing is provided on the upper end of the drain port forming body to The present invention can be similarly applied to a structure that seals between the openings.
(4) The present invention is not limited to the horizontal refrigerator exemplified in the above embodiment, but includes a vertical refrigerator, a freezer, a warm storage, etc., and a main body composed of a heat insulating box. It can be widely applied to all types of storage.

Sectional drawing which shows the whole horizontal refrigerator structure which concerns on Embodiment 1 of this invention. Disassembled cross-sectional view of the drainage port Exploded sectional view showing the mounting structure of the drain port forming body Perspective view of drain outlet Exploded sectional view of seal part with packing Cap perspective view Sectional view showing the fixing operation of the drain port forming body Sectional drawing which shows assembly operation of interior bottom plate and exterior bottom plate Sectional view seen from the front in a state where the outer shell of the drain port forming part is formed Side cross-sectional view of drainage port forming part The fragmentary sectional view of the seal part by packing concerning Embodiment 2 The fragmentary sectional view concerning Embodiment 3 The fragmentary sectional view concerning Embodiment 4 Exploded sectional view of a seal portion by packing according to Embodiment 5 Partial sectional view Sectional view of the drainage structure according to the conventional example

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Refrigerator main body (storage main body) 11A ... Bottom wall 14 ... Interior box 15 ... Exterior box 16 ... Foam resin (heat insulating material) 30 ... Drain port 32 ... Interior bottom plate 33 ... Circular hole (opening) 36 ... Exterior plate 37 ... Circular Hole (opening) 37A ... Rear edge 40 (40A of circular hole 37) 40, 40A, 40B, 40C, 40D ... Reinforcing plate 50 ... Drainage port forming body 58 ... Mounting rod 60 ... Packing 62 ... Mounting groove 63 ... Skirt 64 ... hem part 64A ... tip edge 65 (65A, 65B, 65C, 65D ... fitting hole (opening) 66 ... ring-shaped part 67, 90, 95, 106 ... groove part 70, 91, 96, 100 ... Rising surface 71, 92, 107 ... Positioning part 72, 93, 97 ... Covering part

Claims (5)

The bottom wall of the storage body, which is formed by filling a heat insulating material made of foamed resin between the interior box and the exterior box, is provided with a drain outlet in a vertical orientation. Each of the openings is formed on the same axis, and the heat insulating material is foam-filled in the space between the interior bottom plate and the exterior bottom plate in a state where a substantially cylindrical drainage port forming body is assembled between the openings. In the drainage structure of the stored storage,
While either one of the upper and lower ends of the drain port forming body is fixed to the opposite edge of the opening in the interior bottom plate or exterior bottom plate facing the opening,
The other end portion of the drainage port forming body is fitted with a cylindrical packing having a hem extending, and the rim portion of the packing is provided on the opposite edge of the opening in the interior bottom plate or the exterior bottom plate. A positioning part that engages the part and regulates the radial expansion of the skirt part is provided,
After the expansion of the hem in the radial direction is restricted, the packing further approaches the interior bottom plate or the exterior bottom plate facing each other, and the back side of the opposed opening while elastically opening and deforming the skirt is deformed. A drainage structure for a storage, characterized in that it is configured to be in close contact with the mouth edge. The positioning portion is formed by a ring-shaped rising surface provided to rise at a mouth edge portion on the back side of the opening in the interior bottom plate or exterior bottom plate facing the packing, and a leading edge of a hem portion of the packing is the rising edge. 2. The drainage structure for a storage according to claim 1, wherein the expansion in the radial direction is restricted by hitting the surface. The drainage structure for a storage according to claim 2, wherein a cover portion is provided on the rising surface so as to cover and prevent the packing from contacting the bottom surface of the packing. A ring-shaped rising surface is provided at the rear edge of the opening of the interior bottom plate or exterior bottom plate facing the packing, and a groove portion into which the skirt portion of the packing is inserted is cut at the base side of the rising surface. 2. The drain outlet structure of a storage according to claim 1, wherein an opening edge of the groove portion serves as the positioning portion that is engaged with a skirt portion of the packing and restricts expansion in a radial direction. . A reinforcing plate is provided on the back surface of the interior bottom plate or the exterior bottom plate facing the packing, and an opening larger than the opening of the interior bottom plate or the exterior bottom plate is formed concentrically on the reinforcement plate. The drainage structure for a storage according to any one of claims 1 to 4, wherein a positioning portion is formed.

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